It's a no-brainer!

Love is a no-brainer.

Almost all expats in China have chosen a wife who speaks English to some degree. Chinese women who both speak English and are attracted to Western men are a unique cohort. I hesitate to characterize these women as 'less attractive' than the norm, but I have been told by many Chinese that they are perceived as such.

Perhaps SB, as you suggest, the 'materialism' of these FT sirens is a general characteristic of Chinese women and in fact all marriage in China requires a socially acceptable 'buy in'.

But it may also be the case that the women in China who are speaking in English to foreign men about a possible relationship are a unique subset of Chinese women.

More research is needed on the mating rituals of FTs in China.